According to Stephen Davies (who is writing a biography of Lipschütz), these were casual games when Lovergrove visited Lipschütz in San Francisco. He provides all the newspaper references given here, which give the result as +2-0=2 for Lovegrove. He also says that the result +3-0=1, as given in John Donaldson's 'History of the MI Chess Room', appears in H.J. Ralston's biography of Lovegrove in the Chess Digest (vol.3, no.10, Oct. 1850). Here, I have taken the result as given in all the early sources: +2-0=2 for Lovegrove.